Data Collection Study for RFP (Respiration From Plethysmogram)

Inclusion Criteria: * Adult subjects (aged 18 years or older) willing and able to understand and provide written informed consent * Paediatric subjects aged 16 years and older willing and able to understand and provide written informed consent * Paediatric subjects aged approx. 4-16 years and their legal guardians, willing and able to understand and provide written informed consent/assent * Subject weight within intended use of at least one SpO2 sensor under test at time of enrolment (M1191T: adult patients \>50kg, M1196T: adult patients \>40kg, M1192A: paediatric patients 15-50kg) * Willing and able to wear study devices during study procedures * Subject undergoing regular spot-check measurements as per the site's standard of care Exclusion Criteria: * Palliative patients * Critically ill patients with severe physiological instability (NEWS ≥9) * Injury/wounds or physical malformation of sensor application site (i.e. fingers, toes, hands, feet) * Subjects with severe contact allergies to standard adhesives, latex or other materials found in pulse oximetry sensors (self-reported) * Unwillingness or inability to remove coloured nail polish or artificial nails from application site * Nail fungus on application site * Severe dermatitis or hyperkeratosis (e.g. ichthyosis) at sensor application site